AiriSan

I'm trying to get a pokemon using phex and I read using the database worked best, so I tried with metagross but the only ones I find that work are beldums, but when i try to change the pokemon from beldum to metagross it pops up the not valid mark. the reason only beldums work is cause the metagrosses wont let me change their IV,s, Personalities and their Ability. I don't know if I wrote that well enough to understand but I hope I did